JPH02159914A - Forcible insertion of wedge for wedge type anchor clamp - Google Patents

Abstract

PURPOSE:To miniaturize installation tools by repeating the tightening and loosening of the wire for a mini block temporarily provided to a come-along on the conductor to tighten and loosen a conductor strain device so that a wedge may be fitted forcibly into a clamp body. CONSTITUTION:A small metal wheel 27, a link 28 and a clamp body 2 are continuously connected through a link 26 to a come-along 22 fitted to a conductor 5 passing through a metal block 21 suspended from a pylon 23. A conductor strain device 24 consisting of links 9a(b), 33 and 38 is connected to the come- along 22 and fitted to the pylon 23. The wire 30 of the semi metal block 27 is tightened, the conductor strain device 24 is disposed in tension with the specified tensile force and a wedge 6 is forcibly fitted into the clamp body 2 with a forcible fitting device 32. The wire 30 is then loosened, the conductor between the come-along 22 and the clamp body 2 is disposed in tension with the specified tensile force and the wedge 6 is forcibly fitted into the clamp body 2 with the forcible fitting device 32 once again. Then, the come-along 22, small metal wheel 17, links 26 and 28, forcible fitting device 32, metal block 21 are removed. The installation tools can thereby be miniaturized and the work at an elevated spot can easily be performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for wedge-pressing a wedge-shaped retaining clamp of a conductor tensioning device mainly used for installing large-span overhead power transmission lines.

[Conventional technology]

Examples of wedge-shaped retaining clamps used in this type of wedge press-fitting method include those shown in FIGS. 9 to 11, for example. This wedge-shaped retaining clamp 1 has a length adjusting plate 33 attached to a clamp body 2 which is openable and closable using a hinge 3 via a pair of support pieces 9a and 9b with bolts 34 and nuts 36.
One support piece 9a is longer than the other support piece 9b, and its tip is attached to the length adjustment plate 33 with a bolt 37. A tapered hole 4 is formed through the clamp body 2, and a pair of tapered wedge pieces 6 holding a conductor 5 is inserted into the tapered hole 4.
a and 6b are inserted, and the jumper side of the conductor 5 is guided by an arcuate guide 10 fixed to the tapered wedge piece 6b. The wedge-shaped retaining clamp 11 shown in FIGS. 12 and 13 has a support shaft 13 attached to the upper part of the insulator side of both side walls of the clamp body 12 having a U-shaped cross section, and the conductor of the clamp body 12 is attached to the support shaft 13. A triangular piece 16 facing the bottom surface 15 of the guide groove 14, a pair of mounting pieces 17a and 17b, and a U-shaped fitting 18 along the bottom outer peripheral surface of the clamp body 12 are attached. Then, a tapered &'41 is inserted between the conductor 5, which is guided by the conductor guide groove 14 and whose jumper side is attached to the arcuate guide 20 with the clamp fitting 19, and the bottom part 15 of the triangular piece 1G. ing.

To tension the conductor 5 with a conductor tensioning device equipped with a wedge-shaped retention clamp as described above, as shown in FIG.
Attach the come-along 22 to the extended conductor 5 on the wire 1,
This come-along 22 and the wedge-shaped retaining clamp of the conductor tension device 24 attached to the tower arm 23, for example, Figs.
A ring attachment part 7 (Fig. 9) protrudes from the side tip of the main body piece 2a of the clamp body 2 of the wedge-shaped retaining clamp 1 shown in Fig. 1.
In advance, link 26, semi-golden wheel 27, tension ring 28
Connect via etc. In this case, the main body piece 2a of the clamp main body 2 is attached to the length adjusting plate 33 with the bolt 37 via the supporting piece 9a, but the supporting piece 9b attached to the main body piece 2b and the length adjusting plate 33 are Bolt 34 to attach and bolt 8 to attach body piece 2b and body piece 2a
has been removed, the main body piece 2b is attached to the main body piece 2a so that it can be opened and closed, and the tapered wedge pieces 6a, 6b are not inserted into the clamp main body 2, and the pair of support A hydraulic cylinder 32 is not attached to the pieces 9a and 9b. On the other hand, the wire 30 wound around the semi-metal wheel 27 has its free end passed through a pulley 31 etc. attached to the steel tower arm 23 and then connected to a winch (not shown). It is installed on. In FIG. 1, numeral 38 is an insulator chain of the conductor tension device 24.

Now, when the wire 30 is wound with a winch while the conductor 5 is fixed to the steel tower side in front of the come-along 22, the semi-metal wheel 27 is shortened, so that the come-along 22
The further conductor 5 and the conductor tensioning device 24 are tensioned. When the conductor 5 is stretched with a predetermined tension, the tapered wedge pieces 6a, 6
A predetermined position of the conductor 5 in a tension-free state between the come-along 22 and the metal wheel 21 is held between the tapered wedge pieces 6a and 6 by b.
b together with the conductor into the tapered hole 4 of the clamp body 2, connect the body pieces 2a and 2b with the pole 8, and further connect the support piece 9b and the length adjustment plate 33 with the bolt 34 and napht 36. (Figure 2). And a pair of support pieces 9a, 9b
A hydraulic cylinder 32 is attached to the e! which consists of a plunger of this hydraulic cylinder 32 and a pair of tapered wedge pieces 6a6b.
! A tool 35 is interposed between the mold 6 and the clamp body 2, and the hydraulic cylinder 32 is operated to press fit the mold 6 into the tapered hole 4 of the clamp body 2 (FIG. 3).

When the wedge 6 is press-fitted, the hydraulic cylinder 32, tool 35 and piping are removed, and the wire 30 is unwound with a winch.
figure). By unwinding the wire, the semi-metal wheel 27 is expanded and relaxed, and the conductor 5 between the come-along 22 and the clamp body 2 is also stretched. Then Come Along 22, Link 2
6. Remove the semi-metal wheel 27, wire tension ring 28, wire 30, pulley 31, metal wheel 21, etc., and adjust the relaxation of the conductor to obtain a normal tensioned state (FIG. 8).

While the conductor is being stretched, the conductor tensile load acts on the clamp body 2 through the wedge 6, and when the tensile load becomes larger than the simulated movement start load, the wedge 6 and the conductor 5 move in the direction of the tensile load, so the tensile load decreases. When the tensile load becomes less than the wedge movement load, the movement is stopped and held by the clamp body 2.

[Problem to be solved by the invention]

If a tensile load exceeding the simulated movement start load is applied to the conductor,
As the pattern and the conductor move in the direction of the load each time, the conductor sag increases. For this reason, the conductor approaches the conductor or structure below, and the amplitude of the conductor increases due to wind pressure.
Insufficient insulation distance and other problems occur.

Therefore, the wedge pressure input was increased to increase the drafting start load. However, in recent years, as overhead power transmission lines have become larger, and attempts have been made to increase the wedge pressure input accordingly, hydraulic cylinder devices have become even higher in pressure and larger, increasing manufacturing costs. The mounting brackets to be attached also become larger and the weight of both the hydraulic cylinder device and the mounting brackets increases, making the work of attaching and removing the hydraulic cylinder to the wedge-shaped retaining clamp at high places even more dangerous and difficult. .

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a wedge press-fitting method for a wedge-shaped retaining clamp that can increase the simulated movement start load without increasing the pressure or increasing the size of the wedge press-fitting device. It is said that

[Means to solve the problem]

In order to achieve this objective, the wedge press-fitting method of the present invention provides a method for connecting a wedge-shaped retaining clamp of a conductor tensioning device attached to a support structure and a come-along attached to a conductor on a wire wheel. Squeeze the stretched wire and tension the conductor beyond the come-along and the conductor tensioning device at the specified tension, then attach it to the clamp body of the wedge-shaped retaining clamp by modeling the specified position of the conductor between the come-along and the metal wheel. A wedge press-fitting device is installed in the wedge-shaped retaining clamp, and the wedge is press-fitted into the clamp body by this wedge press-fitting device.When the press-fitting is completed, the wire is loosened and the conductor between the come-along and the clamp body is also stretched, and then This is characterized in that the wedge is press-fitted into the clamp body again by a wedge press-fitting device to increase the load at the start of drafting movement.

A fluid pressure cylinder device may be used as the wedge press-fitting device.

[For production]

By squeezing the wire passed between the wedge-shaped retaining clamp of the conductor tensioning device attached to the support structure and the come-along attached to the conductor on the wire wheel, the come-along and the wedge-shaped retaining clamp will approach each other. The conductor beyond the come-along and the conductor tensioning device are tensioned. When the conductor is stretched to a predetermined tension, a predetermined part of the conductor between the come-along and the metal wheel is attached to the clamp body of the wedge-shaped retention clamp via a wedge, and a wedge press-fit device is attached to the wedge-shaped retention clamp side. The pattern is press-fitted into the clamp body using a wedge press-fitting device. Then, while the wedge press-fitting device remains attached to the wedge-shaped retaining clamp, the wire between the come-along and the clamp body is loosened. As a result, the conductor between the come-along and the clamp body is also stretched, and the tensile load of the conductor is transmitted to the clamp body via the sleeve. After that, the pattern is again press-fitted into the clamp body using the wedge press-fitting device. In other words, in the first wedge press-fitting, no conductor tensile load is acting on the clamp body, so when the wedge is press-fitted into the clamp body with the press-in force Po. Simulated movement start load F,
FP = Po' kp However, in the second wedge press-fit, the conductor tensile load F is applied to the clamp body. is acting, so the press force P. The wedge movement start load F when the wedge is press-fitted into the clamp body. is FM = (Po + Fo) k, l.

That is, the difference between the second and first drafting start loads is: FN FP= (Po+Fo)k14-Po' kp
It is. Here, since the constant kN and the constant kp are about 0.8 from past test results and are approximately equal, the first and second press-in forces P. are the same, the second wedge movement starting load F,
l is the first wedge movement starting load N, which is approximately P0・k2
[Embodiment] An embodiment of the present invention will be described based on the drawings.

Fig. 1 shows that a come-along 22 is attached to the conductor 5 on the wire wheel 21, a conductor tensioning device 24 is attached to the tower arm 23, and the wedge-shaped retaining clamp 1 (Fig. 9 -
The ring reporting section 7 and the come-along 22 shown in FIG. It is shown attached to a winch (not shown) via a pulley 31 etc. attached to the arm 23.

Now, if the wire 30 is wound up with a winch while the conductor 5 is fixed to the steel tower side in front of the come-along 22, the conductor 5 and the conductor tension device 24 beyond the come-along 22 will be shortened because the semi-metal wheel 27 will be shortened. is set up (
Figure 2). When the conductor 5 is stretched with a predetermined tension, a predetermined portion of the conductor in a non-tensioned state between the two come-alongs 22 and the metal wheel 21 is held between the tapered mock pieces 6a and 6b, and the tapered mock piece 6a, 6b into the tapered hole 4 of the clamp body 2. Next, a wedge press fitting device, in this embodiment a hydraulic cylinder 32 which is one of the fluid pressure cylinder devices, is attached to the pair of support pieces 9a, 9b, and the plunger of this hydraulic cylinder 32 and the pair of tapered pieces 5a, 5b are attached. A tool 35 is interposed between the two, and the hydraulic cylinder 32 is operated to press fit the sleeve 6 into the clamp body 2 (FIG. 3). The above wedge press-fitting method is as described in detail in the prior art section.

In the wedge press-fitting process, since the conductor 5 inserted into the clamp body 2 is in a tension-free state, no conductor tensile load is added to the lateral movement start load obtained by the wedge press-fit.

In this example, when the first wedge press-fitting process is completed (
(Fig. 3), with the hydraulic cylinder 32 installed, the wire 3
Unwind 0. As a result, the semi-metal wheel 27 is expanded and relaxed, and the conductor between the come-along 22 and the clamp body 2 is also stretched (FIG. 4). Thereafter, the pattern 6 is again press-fitted into the clamp body 2 by the hydraulic cylinder 32. For this reason, the second
In the wedge press-fitting step, the clamp body 2 is subjected to the tensile load of the conductor and the press force of the hydraulic cylinder 32. is press-fitted into
The lateral movement start load becomes much larger than in the first case.

When the wedge press-fitting work is finished again using the hydraulic cylinder 32,
Come-along 22, link 26, semi-metal wheel 27, tension ring 28, wire 30, and pulley 31 are removed (Fig. 5).
Furthermore, remove the metal wheel 21, wedge press-fit device 32, piping, etc. The conductor 5 beyond the come-along 22 and the conductor tensioning device 24 are then stretched, and then the predetermined position of the conductor between the come-along 22 and the metal wheel is attached to the clamp body 12 using the pattern 41. Attach one end of the wedge press-fitting device 42 to the shaped fitting 18 and insert its plunger (not shown).
is brought into contact with the wedge 41, and the wedge press-fitting device 42 is operated to press-fit the pattern 41 into the clamp body 12. In this first wedge press-fitting step, no conductor tensile load is applied to the clamp body 12. When the first press-fitting step is completed, the wire 30 is loosened and the conductor between the come-along 22 and the clamp body 12 is stretched. (FIG. 15, but the wire 30 and the come-along 22 are removed in the figure). Here, the wedge press-fitting device 42 is pressed again.
The sleeve 41 is press-fitted into the clamp body 12 by the following steps. In this wedge press-fitting process, a conductor tensile load is acting on the clamp body 12, so the drafting start load F is compared to the first wedge movement start load F, and the press force of the wedge press-fitting device is the same. However, it grows exponentially.

〔Effect of the invention〕

As explained above, according to the wedge press-fitting method of the wedge-shaped retaining clamp according to the present invention, compared to the conventional wedge press-fitting method, even if the press force of the wedge press-fitting device is the same, the lateral movement start load is dramatically larger. This reduces the weight of wedge press-fit devices and mounting brackets, etc.
It is possible to reduce the size and reduce manufacturing costs, and it is relatively easy and safe to install and remove this type of device, mounting brackets, etc., which require work at high places.

[Brief explanation of the drawing]

1 to 6 are explanatory diagrams of the wedge press-fitting method of the wedge-shaped retaining clamp according to the present invention, FIGS. 9 is an explanatory diagram of the conventional wedge press-fitting method, FIG. 9 is a plan view of the wedge-shaped retaining clamp used in the present invention, and FIG.
0 is a side view of the same, FIG. 11 is a sectional view taken along the line A-A in FIG. 10, FIG. 12 is a side view of another wedge-shaped retention clamp used in the present invention, and FIG. B-BN
s cross-sectional view, Figure 14 is the first one using the same type retaining clamp.
FIG. 15 is an explanatory diagram of the second wedge press-fitting process. 1.11...Wedge-shaped retaining clamp, 2.12...Clamp body, 5...Conductor, 6.41...Model, 21...Golden wheel, 2
2. Come-along, 23. Support structure, 24. Conductor tension device, 30. Wire, 32.42. Wedge press-fit device. 6.21.--Gold car

Claims (1)

[Claims] 1. A conductor tension device (
Wring out the wire (30) passed between the wedge-shaped retaining clamps (1) and (11) in 24) and the come-along (22) attached to the conductor (5) on the wire wheel (21). conductor and conductor tension device (24) beyond come-along (22)
) at the specified tension, and then come along (22
) and the metal wheel (21) with a wedge (6),
Attach (41) to the clamp bodies (2) and (12) of the wedge-shaped retention clamps (1) and (11), and attach the wedge-shaped retention clamps (
1) and (11) are provided with wedge press-fitting devices (32) and (42), and the wedge press-fitting devices (32) and (42) are used to form a wedge (6).
, (41) into the clamp bodies (2) and (12),
When the press-fitting is completed, loosen the wire (30) and tension the conductor (5) between the come-along (22) and the clamp bodies (2), (12), and then tighten the wedge press-fitting device (32), ( 4
2) to attach the wedge (6) to the clamp body (2) and (12).
, (41) is press-fitted to increase the wedge movement starting load. 2. The wedge press-fitting method for a wedge-shaped retaining clamp according to claim 1, wherein the wedge press-fitting devices (32) and (42) are fluid pressure cylinder devices.